－What happened?

－As if from ________, the man appeared, which frightened me so much.

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The mother often tells her son to be a good boy, warning him to ________ trouble.

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－Thank you very much.

－Not at all, it is ________ my duty as yours.

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________ the students were having the exciting news!

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There's still ________ gap between the top and the bottom income groups in this countries.

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When people talk about the cities of the US, the first ________ comes into mind is New York.

[　　]

Watching children, especially ________ they don't know you are doing so, is really a pleasure.

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Someone called me up in the middle of the night, but they hung up ________ I could answer the phone.

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－You've left the light on.

－Oh, so I have. ________and turn it off.

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－Hey, look where you are going!

－Oh, I'm terribly sorry. ________.

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